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1,904 questions

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Question 601

waec 2001

A resistance thermometer has a resistance of 20\(\Omega\) at 0^oC and 85\(\Omega\) at 100^oC. If its resistance is 52\(\Omega\)in a medium, calculate the corresponding temperature

A49.2^oC

B60.6^oC

C80.0^oC

D84.7^oC

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Question 602

waec 2001

a beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal. [neglect the weight of the beam]

A32.0N

B26.7N

C16.0N

D13.3N

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Question 603

waec 2001

A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]

A21

B38

C48

D151

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Question 604

waec 2001

A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine

A10.0

B13.3

C17.5

D25.0

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Question 605

waec 2001

Electrical resistance is a property of an electrical energy to be converted into

Amechanical energy

Bheat energy

Cmagnetic energy

Dchemical energy

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Question 606

waec 2001

Which of the following statements about elastic collision is correct?

Amomentum is lost due to the sound produced

Bloss of momentim is equal to loss in kinetic energy

Cboth kinetic energy and momentum are conserved

Dkinetic energy is lost while momentum is conserved

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Question 607

waec 2001

The time rate of change of momentum is

Aimpulse

Bforce

Cpower

Dpressure

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Question 608

waec 2001

The amplitude of a particle executing simple harmonic motion in 5cm while its angular frequency is 10 rad s^-1. calculate the magnitude of the maximum acceleration of the particle

A0.25ms^-2

B0.50ms^-2

C2.00ms^-2

D5.00ms^-2

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Question 609

waec 2001

The amplitude of the motion of a body performing simple harmonic motion decreases with time because

Afriction force dissipate the energy of motion

Bthe frequency of oscillation varies with time

Cthe period of oscillation varies with time

Denergy is supplied by some external agency

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Question 610

waec 2001

Which of the following equations represents the distance x, travelled by a body moving on a straight road with a constant speed? [The other symbol have their usual meanings]

Ax = Ut + \(\frac{1}{2}t^2\)

Bx = Ut

Cx = \(\frac{V^2 - U^2}{2a}\)

Dx = -\(\frac{1}{2} at^2\)

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Question 611

waec 2001

A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the friction force on the block

A0.3N

B0.5N

C3.0N

D5.0N

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Question 612

waec 2001

The apparent weight of a body fully immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. [Density of water = 1000kgm^-3, g = 10ms^-2]

A8.9 x 10^-3m³

B6.4 x 10^-3m³

C3.2 x 10^-3m³

D3.0 x 10^-3m³

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Question 613

waec 2001

Which of the following statements about pressure is not correct? pressure

Aincreases with an increase in surface area

Bdecreases with an increase in surface area

Cincreases with a decrease in surface area

Dincreases with an increase in the applied force

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Question 614

waec 2001

An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object

A20N

B10N

C6N

D4N

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Question 615

waec 2001

A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms^-2, determine the reading on the spring balance. [g = 10ms^-2]

A24.0N

B12.5N

C7.5N

D4.0N

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Question 616

waec 2001

Which of the following physical processes cannot be explained by the molecular theory of matter?

Aevaporation

Bthermal conduction

Cradiation of heat

Dconvectional current of fliuds

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Question 617

waec 2000

The duality of matter implies that matter

Aexists as a particle of dual composition

Bhas momentum and energy

Chas both wave and particle properties

Dis made up of dual materials

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Question 618

waec 2000

In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order. i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the reactor. iii. The turbines in turn generate electricity. iv. The water then passes through some form of heat exchanger to produce steam

Aii, iv, i and iii

Bi, ii, iii and iv

Ciii, i, iv and ii

Div, i, iii and ii

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Question 619

waec 2000

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

A11

B12

C23

D34

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Question 620

waec 2000

A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from \(\frac{4}{3}E_k\) to E level, determine the wavelength of the photon that would be emitted

A3\(\lambda_o\)

B2\(\lambda_o\)

C\(\frac{3}{4}\)\(\lambda_o\)

D\(\frac{1}{3}\)\(\lambda_o\)

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